package websocket;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.stream.ChunkedWriteHandler;


public class WebSocketServer {
    public void run(int port) throws Exception {
		EventLoopGroup bossGroup = new NioEventLoopGroup();
		EventLoopGroup workerGroup = new NioEventLoopGroup();
		try {
			ServerBootstrap b = new ServerBootstrap();
			b.group(bossGroup, workerGroup)
				.channel(NioServerSocketChannel.class)
				.childHandler(new ChannelInitializer<SocketChannel>() {

					@Override
					protected void initChannel(SocketChannel ch) throws Exception {
						ChannelPipeline pipeline = ch.pipeline();
						pipeline.addLast("http-codec", new HttpServerCodec());
						pipeline.addLast("aggregator", new HttpObjectAggregator(65536));
						ch.pipeline().addLast("http-chunked", new ChunkedWriteHandler());
						pipeline.addLast("handler", new WebSocketServerHandler());
					}
				});

			Channel ch = b.bind(port).sync().channel();
			System.out.println("Web socket server started at port " + port + '.');
			System.out.println("Open your browser and navigate to http://localhost:" + port + '/');

			ch.closeFuture().sync();
		} finally {
			bossGroup.shutdownGracefully();
			workerGroup.shutdownGracefully();
		}
    }

    public static void main(String[] args) throws Exception {

    	new WebSocketServer().run(8765);
    }
}
